\\[-1.8ex] Soil Heterogeneity & $-$0.572$^{***}$ & $-$0.469$^{***}$ & $-$0.463$^{***}$ & $-$0.456$^{***}$ & $-$0.455$^{***}$ & $-$0.456$^{***}$ & $-$0.456$^{***}$ \\ 
  & (0.183) & (0.164) & (0.162) & (0.159) & (0.159) & (0.159) & (0.160) \\ 
\\[-1.8ex] 
Observations & 14,063 & 14,063 & 14,063 & 14,063 & 14,063 & 14,063 & 14,063 \\ 
R$^{2}$ & 0.334 & 0.347 & 0.348 & 0.349 & 0.349 & 0.349 & 0.349 \\ 
